Rotary pump



June 6, 1933. J 'F JAWORQWSR, 1,912,845

ROTARY PUMP Filed March 17, 1930 2 Sheets-Sheet l INVENTOR M Mfm,

ATTORNEY June 6, 1933. J. F. JAwoRowsKl 1,912,845

ROTARY PUMP /4 FVE`-6 -TIIIIIIIL 2'? INVENTOR `easily displaced andthen diliicult and realign Withthe blades unless the whole particularway` sojthatthe equalizinglever Patented June 6, `1933 UNITEDSTMES PATENT OFFICE L JosEPH F. JAwoRowsKI, or oLnvnnaNnoi-Iro, AesIGNoR or riva-niorrrrnnntrrrs To UsAMUEn E. nn'frfrnmsacnr,-` srvnnrenrnnnrns yro saar nainnsoN, AND TwornIeH'rnnNrHs rennes1; Henman-r.- oF cnnvntenn, omo i .ROTARY Pmi/ir if emanati@ med Narni 17, 1930. semi No. 436,271.

This invention relates to an improvement in rotarypumps, and moreparticularly a pump of the "type and kind `shown anddei. scribed in my application for patent Serial A No. 243,810, filed: Dec. 31, 1927, in Awhich a pair of rotar'ypistdns co-act with reciprocable abutment members or bladesand an equalize ing lever is used to control themovements of the blades. In pumps of that type the recipn rocable abutment membersor blades aresub` ject to unequal `strains and binding move` ments detrimental to the life and operation of the pump,

pump is disassembled. lVlv present object is to obviate they objections noted, lirst, by embodying in the pump structure `means for utilizingthe pressure created in the pump to counteract tilting and binding movements of the `bladesy and toproduce a smooth working action of each :well` as uniormwearthereon and `eliiective sealing results between the suction and pressure sides of the pump, and .sec-

ondly, by constructing-the pump body in a maybe held constantly upright in free but true working alignment with the reciprocable `blades, vand with the parts `arranged to prevent-the'displacement 01E-the lever from its working place of rest when the adjusting nut and spring and/or thepressure-applying j plunger associated with thelever are released `or removed from the pump;`

In the `accompanying.drawings Fig. 1 is a plan View oi the pump,partlyin section hori zontally,online 1.-1 of Fig. Fig. 2 is a sectional view-horizontally of the pump on line 2-2 of Fig. 4. Fig. 3 is acrosssection bers, on line 3-3 of Fig. 4. 4 isa sec tional view `longitudinally through the pump on line 4 -4 of Fig. 2. Fig. 5 is a sectional view transversely of the pump on the median line marked 5-.-5 on Fig. 4. Fig. 6 is a sectional view of the upper part of the pump, showing the equalizing lever in position without the adjusting nut, spring and plunger.

The pump comprises a main body 2 having a circular chamber 3 therein which is divided and the equalizing lever is also to replace working spaces 5 and G. small area of each slidable abutment member S0 of the pump through one of .its working cham-` two working spaces 5 and 6, respectively,

within which a pair of` round pistons 7 and 8 are adapted to rotate. These pistons are mounted eccentrically in balanced relation on a power shaft 9`havingrotatable bearing in a pair 'of removable end plates or heads 10 and 11, respectively, for body 2. Separate inlet and outlet ports 12 and 14, respectively are located in opposite sides of body 2 and communicate with the working spaces 5 and 6 on opposite sides of an extensionl of partition 4. Extension 15 is a short flat-sided bar having an enlargement 16 at one end in-` terlocked with partition 4l, and it occupies a F central positionwithin a longitudinal slot 17 which communicates at its lower end with the working spaces 5` and 6 and at its upper end with a closed compartment 18 in body 2.

A pair oi liat sliding abutment members or plates 19 and 20, respectively, occupy slot 17 where divided byextensionbar 15, and the reduced lower ends ot 'these plates are adapted to project into the working spaces and have riding `contact with the peripheral '75 surfaces of the eccentric pistons, `thereby separating the inlet and outlet ports cour pletely where they communicate with the Accordingly, a

or blade is exposed to both the suction and pressure sides ol the pump and to the `iiuid passing through the pump. As aresult the lower part of each blade is pressed constantly against one wall of slot 17 and slightly apart from the opposite wall .l Therotatable i movement of the pistons is also in adirection i which tends to press the blades `toward `the suction side oi lthe chamber and wall at that side. As a result these forces tend jointly to tilt and bind the blades slightly in the slot in operating the pump, and cause chatter and undesirable `:friction and wear on the? parts. To counteract and `eliminate the objections noted, the wall 22on the pressure: 5l

of the blade, preferably against the upper half of the blade and centrally between its vertical edges, see Figs. 3 and 4, thereby holding each slidable blade in a fiat seating position against the opposite wall 28 and slightly apart from wall 22 during pumping operations. The slight clearance afforded between the upper half of each blade and wall permits the liuid on thepressure side to pass into upper compartment 18 in body 2 wherein an equalizing bar or rocking vlever 24 is confined and seated at its opposite ends upon the upper fiat edges of the slidable blades 19 and 20, respectively. The upper flat surface or area of each blade is thus always exposed to the pressurecreate'd in the outlet port by the pump, which pressure maintains the blades in constant riding contact with the rotating piston.

The blades 19 and 2O are also controlled and held in their proper working relations by rocking lever 24 and a compression spring 25 which is interposed between a supporting plunger 26 and an adjustable sealing nut 27 seated within the upper part of body 2. Plunger 26 is a cylindrical piece free to move vertically in a round bore in body 2, and spring 25 is seated within a recess in the upper end of this plunger, while its lower end is bifurcated to receive the flat-sided rocking lever 24. An axial passage 26 in the plunger permits the fluid under pressure to pass upwardly into the space beneath nut 27 so as to equalize the pressure on this part, and the bifurcated portions of the plunger are grooved transversely to receive and rest astride a short trunnion or a pivot shaft 28 located mid-length of rocking lever 24, there-4 by positioning this lever centrally in respect to the yslidable blades so that the rounded ends 29 thereof rest upon the smooth flat upper edges of said blades. The plunger is prevented from turning and the lever also held upright in parallel alignment with both slidable blades by providing a depending boss 30 centrally within compartment 18, and slotting this boss 30 vertically and radially thereof to receive and confine the opposite ends of the lever. In effect the upper end of body 2 is slotted so that lever 24 can work freely but not tilt laterally nor be displaced or unseated, even though nut 27, spring 25 and plunger 26 are bodily removed froln body 2 when inspection or repairs of these parts are undertaken.

A by-pass passage 31 is also provided in head 11 between the inlet and outlet ports of the pump, which passage contains a springpressed valve 32 adapted to open and permit the fluid to circulate through the pump should the discharge be checked or cut-olf while the pump is running. The pump also includes a strainer 33 in the intake 34, but as these features are fully described in the co-pending application referred to herein,

further, detailed description thereof is unnecessary and will be omitted herefrom.

What I claim, is:

l. In a rotary pump, a body having an inlet and outlet, circular chambers in open communication with said vinlet and outlet, slot-s extending radially from said chambers, fluid passages extending from said outlet centrally to said slots, a compartment open to said slots, a slotted boss extending into said compartment and a cylinderical bore extending through said body from the outside and through said boss to said compartment in the plane of said slot-s.

2. A rotary pump, comprising a body having circular chambers, rotary pistons situated eccentrically within said chambers, reciprocable solid blades engaging said pistons, a vertically shiftable pivoted equalizing lever support-ed by said blades, yielding devices to force said lever toward said blades, and a slotted boss integrally formed with said body for guiding said yielding devices and the central portion of said lever and holding said lever in its normal working position when said yielding devices are removed.

3. A rotary pump, comprising a body having a pair of circular working chambers separated by a central division Wall, said body also having a compartment and vertical slots connecting said compartment and said chambers, said body being further provided with a slotted boss extending into said compartment and separate inlet and outlet port-s communicating with said working chambersadjacent the slots, a pair of rotatable pistons eccentrically mounted within said circular chambers, a pair of abutment blades slidably confined within said slots and engaging said pistons, said body having a bore within said slotted boss,A commmunicating with said compartment, a shiftable equalizing lever slidably confined within the slots of said boss having a pivot shaft mid length thereof and supported at its opposite ends upon said blades, a bifurcated plunger having opposite slots arranged axially shiftable Within said bore and separably engaging the pivot shaft of said lever for pivotal support thereof, a compression spring seat-ed within said bore against said plunger, vand means detachably connected with said body and bearing against said spring.

In testimony whereofI hereby aliX my signature.

JOSEPH F. JAWOROWSKI. 

